Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6039795 | Ink composition for oil marking pen | Hidetoshi Fukuo | 2000-03-21 |
| 5762694 | Ink composition for marking pen | Hirofumi Yamasaki, Yasuji Okuda | 1998-06-09 |
| 5698614 | Fluorescent ink composition for use in marking pens | Hiroaki Ueda, Yasushi Okuda | 1997-12-16 |